NativeFloat64Array.java revision 1036:f0b5e3900a10
1/* 2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package jdk.nashorn.internal.objects; 27 28import static jdk.nashorn.internal.codegen.CompilerConstants.specialCall; 29import java.lang.invoke.MethodHandle; 30import java.lang.invoke.MethodHandles; 31import java.nio.ByteBuffer; 32import java.nio.DoubleBuffer; 33import jdk.nashorn.internal.objects.annotations.Attribute; 34import jdk.nashorn.internal.objects.annotations.Constructor; 35import jdk.nashorn.internal.objects.annotations.Function; 36import jdk.nashorn.internal.objects.annotations.Property; 37import jdk.nashorn.internal.objects.annotations.ScriptClass; 38import jdk.nashorn.internal.objects.annotations.Where; 39import jdk.nashorn.internal.runtime.JSType; 40import jdk.nashorn.internal.runtime.PropertyMap; 41import jdk.nashorn.internal.runtime.ScriptObject; 42import jdk.nashorn.internal.runtime.arrays.ArrayData; 43import jdk.nashorn.internal.runtime.arrays.TypedArrayData; 44 45/** 46 * Float64 array for the TypedArray extension 47 */ 48@ScriptClass("Float64Array") 49public final class NativeFloat64Array extends ArrayBufferView { 50 /** 51 * The size in bytes of each element in the array. 52 */ 53 @Property(attributes = Attribute.NOT_ENUMERABLE | Attribute.NOT_WRITABLE | Attribute.NOT_CONFIGURABLE, where = Where.CONSTRUCTOR) 54 public static final int BYTES_PER_ELEMENT = 8; 55 56 // initialized by nasgen 57 @SuppressWarnings("unused") 58 private static PropertyMap $nasgenmap$; 59 60 private static final Factory FACTORY = new Factory(BYTES_PER_ELEMENT) { 61 @Override 62 public ArrayBufferView construct(final NativeArrayBuffer buffer, final int byteOffset, final int length) { 63 return new NativeFloat64Array(buffer, byteOffset, length); 64 } 65 66 @Override 67 public Float64ArrayData createArrayData(final ByteBuffer nb, final int start, final int length) { 68 return new Float64ArrayData(nb.asDoubleBuffer(), start, length); 69 } 70 71 @Override 72 public String getClassName() { 73 return "Float64Array"; 74 } 75 }; 76 77 private static final class Float64ArrayData extends TypedArrayData<DoubleBuffer> { 78 79 private static final MethodHandle GET_ELEM = specialCall(MethodHandles.lookup(), Float64ArrayData.class, "getElem", double.class, int.class).methodHandle(); 80 private static final MethodHandle SET_ELEM = specialCall(MethodHandles.lookup(), Float64ArrayData.class, "setElem", void.class, int.class, double.class).methodHandle(); 81 82 private Float64ArrayData(final DoubleBuffer nb, final int start, final int end) { 83 super(((DoubleBuffer)nb.position(start).limit(end)).slice(), end - start); 84 } 85 86 @Override 87 protected MethodHandle getGetElem() { 88 return GET_ELEM; 89 } 90 91 @Override 92 protected MethodHandle getSetElem() { 93 return SET_ELEM; 94 } 95 96 @Override 97 public Class<?> getElementType() { 98 return double.class; 99 } 100 101 private double getElem(final int index) { 102 try { 103 return nb.get(index); 104 } catch (final IndexOutOfBoundsException e) { 105 throw new ClassCastException(); //force relink - this works for unoptimistic too 106 } 107 } 108 109 private void setElem(final int index, final double elem) { 110 try { 111 nb.put(index, elem); 112 } catch (final IndexOutOfBoundsException e) { 113 //swallow valid array indexes. it's ok. 114 if (index < 0) { 115 throw new ClassCastException(); 116 } 117 } 118 } 119 120 @Override 121 public MethodHandle getElementGetter(final Class<?> returnType, final int programPoint) { 122 if (returnType == int.class || returnType == long.class) { 123 return null; 124 } 125 return getContinuousElementGetter(getClass(), GET_ELEM, returnType, programPoint); 126 } 127 128 @Override 129 public int getInt(final int index) { 130 return (int)getDouble(index); 131 } 132 133 @Override 134 public long getLong(final int index) { 135 return (long)getDouble(index); 136 } 137 138 @Override 139 public double getDouble(final int index) { 140 return getElem(index); 141 } 142 143 @Override 144 public Object getObject(final int index) { 145 return getDouble(index); 146 } 147 148 @Override 149 public ArrayData set(final int index, final Object value, final boolean strict) { 150 return set(index, JSType.toNumber(value), strict); 151 } 152 153 @Override 154 public ArrayData set(final int index, final int value, final boolean strict) { 155 return set(index, (double)value, strict); 156 } 157 158 @Override 159 public ArrayData set(final int index, final long value, final boolean strict) { 160 return set(index, (double)value, strict); 161 } 162 163 @Override 164 public ArrayData set(final int index, final double value, final boolean strict) { 165 setElem(index, value); 166 return this; 167 } 168 } 169 170 /** 171 * Constructor 172 * 173 * @param newObj is this typed array instantiated with the new operator 174 * @param self self reference 175 * @param args args 176 * 177 * @return new typed array 178 */ 179 @Constructor(arity = 1) 180 public static NativeFloat64Array constructor(final boolean newObj, final Object self, final Object... args) { 181 return (NativeFloat64Array)constructorImpl(newObj, args, FACTORY); 182 } 183 184 NativeFloat64Array(final NativeArrayBuffer buffer, final int byteOffset, final int length) { 185 super(buffer, byteOffset, length); 186 } 187 188 @Override 189 protected Factory factory() { 190 return FACTORY; 191 } 192 193 @Override 194 protected boolean isFloatArray() { 195 return true; 196 } 197 198 /** 199 * Set values 200 * @param self self reference 201 * @param array multiple values of array's type to set 202 * @param offset optional start index, interpreted 0 if undefined 203 * @return undefined 204 */ 205 @Function(attributes = Attribute.NOT_ENUMERABLE) 206 protected static Object set(final Object self, final Object array, final Object offset) { 207 return ArrayBufferView.setImpl(self, array, offset); 208 } 209 210 /** 211 * Returns a new TypedArray view of the ArrayBuffer store for this TypedArray, 212 * referencing the elements at begin, inclusive, up to end, exclusive. If either 213 * begin or end is negative, it refers to an index from the end of the array, 214 * as opposed to from the beginning. 215 * <p> 216 * If end is unspecified, the subarray contains all elements from begin to the end 217 * of the TypedArray. The range specified by the begin and end values is clamped to 218 * the valid index range for the current array. If the computed length of the new 219 * TypedArray would be negative, it is clamped to zero. 220 * <p> 221 * The returned TypedArray will be of the same type as the array on which this 222 * method is invoked. 223 * 224 * @param self self reference 225 * @param begin begin position 226 * @param end end position 227 * 228 * @return sub array 229 */ 230 @Function(attributes = Attribute.NOT_ENUMERABLE) 231 protected static NativeFloat64Array subarray(final Object self, final Object begin, final Object end) { 232 return (NativeFloat64Array)ArrayBufferView.subarrayImpl(self, begin, end); 233 } 234 235 @Override 236 protected ScriptObject getPrototype(final Global global) { 237 return global.getFloat64ArrayPrototype(); 238 } 239} 240